Thunderjet for S&S or Mikuni 42/45 mm

[Chas_Dyna_95]

First off Great Site and I'm glad I found it!!!!

I have a question about carb choices...Would I be better installing a Thunder-Jet on the S & S or a Mikuni 42 or 45mm for my Dyna.

Bike: 2001 FXD 95"
Heads: SE Performace Heads
Pistons: SE 10:1 Flat-top
Cams: Andrews TW-55 & Adj. Pushrods
Big Dog Roller Rockers
Cometic .030 Head Gaskets
Carb: S&S Super E
Ignition: Daytona Twin-Tech
Pipes: Supertrapp 2-1 18 Discs w/ Open End Cap

I'd say that my riding is appox a 70-30 split between tooling around town with the old lady and stoplight and hiway blasting with the guys and I'm looking for a good compromise.

Overall the above build runs strong and I'm generally happy with it.....you grab a handfull of throttle and and above 3000 and it pulls strong rignt up to 6200 rev limiter.....but it just doesn't feel......well...smooth and linear tooling around town.
Now I know that the 2-1 cause a dip in the 2500rpm range and the cams are really do shine above 2800-3000rpm range, but I have to admit I was impressed with the old 40mm CV with a ThunderSlide in it when it was an 88 with the Supertrapp....power delivery just felt smoother all around.

Then again the Super E while being simple and easy to work on isn't exactly the most modern design with 2
circuits and a pump, but it is a step up from the the old Super B I used to run on my Shovel that you used to have to gently roll-on if you didn't want it to bog.

Basically what I'm asking is would you reccommend the 42 Mikuni for higher intake velocity better fuel atomization and crisper throttle response or would I need the 45 to get the most of the motor OR should I go with the Thunder Jet to get the 3rd fuel circuit in the S&S.

Thanks

[Mike]

I'm a huge Mikuni fan but you've already invested in the S&S and I don't like to see people spedn money twice unless the gains are really justified. Equiped with a thunderjet the S&S will work fairly well and likely make the same power as a Mik 42. You really get two more tuning circuits with the T jet via the air bleed (now standard on S&S carb). Having said all that, the Mik 45 will flow more air and possibly improve overall performance. Your torque dip will still be there, on the dyno chart, with your combo but the bike will feel more linear and sharper when riding.
Mike